It is not possible to know as far as I know from the data providers available today. That is one reason why I shifted to using a market cap and liquidity filter rather than using any pre-determined index like NSE500.
This also has challenges if tested over a long term. Mcap today of 5000crs is not the same as a 5000cr mcap in 2005 due to inflation. So, there is no ideal solution to this.
Another important point for me is backtesting is an indicator of the results possible by a system. I don’t take it at full face value simply because there could be many data errors which I may not even be aware of.
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